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Macro 900 Operation Manual
15.1.5.
Calibrating the Turbidity 1000 NTU Point
Remove the Probe from the calibration bottle, rinse thoroughly in fresh water (if
using MacroCal solution), shake off any excess and dry the outer sleeve with a
soft cloth.
Gently invert,
do not
bottle of StablCal
Standard solution (manufactured by the HACH Company and available from
most lab supply companies) several times to thoroughly mix.
Formazin Turbidity Standard is hazardous to your health. Be sure to
handle with care and to read and comply with all health and safety
advice.
Fill a calibration bottle with the solution and drop the Probe in all the way.
Again, bang the Probe against the bottom of the bottle several times in order to
remove any air bubbles that may be clinging to the Turbidity electrode.
Follow the procedure detailed above for Zero point calibration as far as step 6,
then select Pt-2. Wait while the Meter stabilises and calibrates.
After successful calibration, the 'Calibrating 100%' screen will be displayed
along with the Calibration Report, which will show the voltage output from the
Turbidity Receiver Electrode in millivolts (mV). Press the OK key to continue.
Turbidity calibration is now complete.
15.1.6.
Errors During Calibration
If a problem occurs during calibration, an error message will be displayed.
Refer to
Error! Reference source not found.
handling.
15.1.7.
Lens and Sleeve Maintenance
On a daily basis, the lenses on the electrode should be wiped over with a soft
damp cloth.
Similarly, the inside of the Probe Sleeve and Sleeve Cap should be kept clean
and free from any deposits that may cause stray reflections.
Never use an abrasive cleaner on the inside of the Probe sleeve or cap
as they have been treated with a non-reflective coating which can be
easily damaged. The inside of the sleeve should be wiped over with a soft
damp cloth and non-abrasive detergent.
Always re-calibrate the zero point after cleaning the sleeve or lenses.
15.1.8.
References
The summary on turbidity at the beginning of this section is based on
© 2013 Palintest Ltd.
shake, freshly prepared 1000 NTU Formazin solution or a
®
Standard 1000 NTU Stabilised Formazin Turbidity
www.palintest.com
in section 10 for error message
V3
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